Well known are the Laws of Classical and Quantum Mechanics. Its origin, however, remains elusive and its understanding contentious. It was argued that unless one manages to derive the Laws of Physics from the very first principles, this condition will continue. We use simple Differential Geometry principles in this paper to yield the Klein-Gordon equation and the Relativistic Mechanics Lagrange equations without using the usual Quantum Mechanics, Special Relativity or even General Relativity postulates.

**Author(s) Details**

**D. M. Kalassa
**Independent Researcher, F-419 Boulevard Alexandre Taché, Gatineau (QC), J9A1M6, Canada.

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